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NiMH vs. NiCAD charging

Discussion in 'Electronic Design' started by Engineer, May 17, 2004.

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  1. Engineer

    Engineer Guest

    Hi, SED's
    I have a Radio Shack battery charger that takes a dozen or so AA NiCAD
    cells and a couple of 9 volt NiCAD batteries as well - very useful

    Can I use it to charge the AA size NiMH cells specified for my digital

    Just how different is the charging circuit for these two types of
    cell. Obviously I want to retire my NiCAD's and use the more
    efficient NiMH's but I'd like not to have to replace the charger.

    Thanks for all replies


  2. Leon Heller

    Leon Heller Guest

    NiMH cells can be charged at C/10 (about 14 hours) the same as NiCds. If
    your charger is this type, it should be OK. If it is a fast charger, I
    wouldn't use it for NiMH; you will need to replace it.

  3. Engineer

    Engineer Guest

    Does anyone know the recommended MIN, MAX and AVERAGE charge rates for
    2300 mAH NiMH cells? The above RS charger seems to put a steady 50 mA
    into a charged NiCAD. I've not tried a NiMH yet but I have 8 NiMH's
    on mail order via eBay.


  4. Dave VanHorn

    Dave VanHorn Guest

    NIMH varies widely.
    Typically, 0.5C to 2C charge rates are reccomended. Less, or more than this
    means you may not be able to detect end of charge. Continuous unterminated
    charging (the old C/10 for nicads) is not reccomended for NIMH cells.
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